@article{10_4171_ggd_133,
     author = {G\"unter Harder},
     title = {Interpolating coefficient systems and $p$-ordinary cohomology of arithmetic  groups},
     journal = {Groups, geometry, and dynamics},
     pages = {393--444},
     year = {2011},
     volume = {5},
     number = {2},
     doi = {10.4171/ggd/133},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/133/}
}